The Sum Of Two Numbers Is 80 And Their Difference Is 20
The problem given says that 2 unknown numbers are given, whose sum is equal to 80 and the difference is 20. Let's find the two numbers :When we add the two numbers :
X + Y = 80
The difference of two numbers :
X - Y = 20
Solution :
If we add the two equations eachother , then we can find the first number.
|
X + Y = 80 X - Y = 20 2X = 100 |
Let's divide 100 to 2 for the first number "X" .
X/2 = 50
First number is 50
X + Y = 80
So ;
50 + Y = 80
Y = 80 - 50
Y = 30
Second number is 30
Question & Answer
The Sum Of Two Numbers Is 80 And Their Difference Is 20 : 50 And 30